Apparatus and method to feed and preheat a metal charge to a melting furnace

a technology of metal charge and apparatus, which is applied in the direction of preheating charge, blast furnace components, waste heat treatment, etc., can solve the problems of metal charge explosion risk, compromising process functionality, and compromising the integrity of the plant, so as to improve the heat yield, prevent the risk of explosion, and increase the safety of the process

US20150153106A1Inactive Publication Date: 2015-06-04DANIELI & C OFF MEC SPA
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
Publication Date
2015-06-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

An apparatus to feed and pre-heat a metal charge to a melting furnace of a steelworks comprises a feeding and pre-heating tower separate from the melting furnace provided with at least one compartment to temporarily contain said metal charge, transfer means to transfer said metal charge to said melting furnace and conveying means to convey the fumes exiting from the melting furnace to said compartment. The apparatus also comprises a post-combustion chamber, disposed adjacent to and below said compartment, and connected on one side to said compartment and on another side to said conveying means the post-combustion chamber being configured to determine the expansion of the fumes introduced by the conveying means and to direct said expanded fumes toward said compartment along a path such as to determine a desired residence time of said fumes suitable to obtain at least the substantial complete combustion of the unburned gases present in said fumes.
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Description

FIELD OF THE INVENTION

[0001] The present invention concerns an apparatus and the corresponding method to feed and pre-heat a metal charge to the melting furnace of a steelworks.BACKGROUND OF THE INVENTION

[0002] Apparatuses are known, for feeding a metal charge to the melting furnace of a steelworks. Before being fed to the furnace, the metal charge or scrap is normally pre-heated by means of the fumes produced by the melting of the metal.

[0003] Some known apparatuses provide a feeding and pre-heating tower for the scrap, integrated with the furnace and disposed directly above it, such as for example in the solution shown in JP 61 015908 A, so that the scrap is discharged from above directly into the liquid bath, with obvious problems, given the quantities of metal charge fed on each occasion, even 40 tonnes, of splashing of the liquid bath and slag, given the height, even 4-5 meters, from which the metal charge is discharged, and also problems of transmission of knocks and vibrations f...

Examples

Embodiment Construction

[0044]With reference to FIGS. 1, 2 and 3, an apparatus 10 according to the present invention is used to feed and pre-heat a metal charge 11, or scrap, to a melting furnace 12 of a steelworks, for example having a capacity of 100-120 t / hr.

[0045]The apparatus 10 comprises a tower 14 to feed and pre-heat the metal charge 11, with a vertical development, which is disposed at the side of and separate and autonomous from the melting furnace 12. In this way the vibrations and / or knocks originating from the tower 14 are discharged onto its own support plane 30 and onto the foundations, and not onto the melting furnace 12.

[0046]Furthermore, the apparatus 10 comprises fume conveying means to convey the fumes exiting from the melting furnace 12 to direct them toward a compartment 13 in order to pre-heat the metal charge 11.

[0047]In this case, the conveying means comprise a first pipe 26 to transport the fumes, which comprises a first end 126 connected to an exit hole 18 of the melting furnace ...